Øvresetertjern, Lake in Oslo, Norway

Øvresetertjern is a small lake in the forested hills north of Oslo, sitting between the Tryvannshøyden hilltop and the Frognerseteren area. Its clear water reveals submerged rocks along the shore, while dense green forest lines the banks and a slender mast rises above the trees on the northern horizon.

A station named Tryvandshøiden stood north of the lake from 1916 to 1938, though it never received regular passenger service. During the Second World War, German occupying forces built two log cabins near the water, one for General von Falkenhorst and another as a recreation spot for officers.

Tomm Murstad's ski school has operated beside the lake since 1934, with a ski lift running in Tommkleiva since 1950. Visitors today can still see children and beginners practicing on the same slopes that shaped local skiing habits for generations.

A parking area near Øvreseterveien gives direct access, and the shore is used for bathing in summer. A lit cross-country ski trail leads toward Tryvannstua, making the lake reachable on foot or skis depending on the season.

One of the three mountain farm buildings in Trevoldskogen, known as Øvre Frognerseter, once stood here before being demolished in 1959. The two wartime log cabins survive today, but they have been repurposed as kindergartens called Onkel Tomms Hytte and Elghytta.